參數(shù)資料
型號(hào)： 935264403005
廠商： NXP SEMICONDUCTORS
元件分類： 無(wú)繩電話/電話
英文描述： TELEPHONE SPEECH CKT, UUC17
封裝： DIE-17
文件頁(yè)數(shù)： 22/30頁(yè)
文件大?。?/td> 178K
代理商： 935264403005
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TEA1111A
Information as of 2000-08-20
TEA1111A; Speech circuit with dialler interface, regulated supply and earpiece volume control
The TEA1111A is a bipolar integrated circuit that performs all speech and line interface functions required in fully electronic telephone sets.
It performs electronic switching between speech and dialling. The IC operates at a line voltage down to 1.5 V DC (with reduced
performance) to facilitate the use of telephone sets connected in parallel.
When the line current is high enough, a fixed amount of current is derived from the LN pin in order to create a strong supply point at pin
V
DD. The voltage at pin VDD is regulated to 3.25 V to supply peripherals such as dialler, LCD module and microcontroller.
l
Low DC line voltage; operates down to 1.5 V (excluding voltage drop across external polarity guard)
l
Line voltage regulator with adjustable DC voltage
l
3.25 V regulated strong supply point for peripheral circuits compatible with:
Speech mode
Ringer mode
Trickle mode.
l
Transmit stage with:
Microphone amplifier with symmetrical high impedance inputs
DTMF amplifier with confidence tone on earpiece.
l
Receive stage with:
Earpiece amplifier with adjustable gain and volume control.
l
MUTE input for pulse or DTMF dialling
l
AGC line loss compensation for microphone and earpiece
l
LED control output.
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